package com.github.hakko.musiccabinet.parser.lastfm;
import static com.github.hakko.musiccabinet.parser.lastfm.ArtistTopTagsHandler.State.COUNT;
import static com.github.hakko.musiccabinet.parser.lastfm.ArtistTopTagsHandler.State.NAME;
import static org.apache.commons.lang.math.NumberUtils.toShort;
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.github.hakko.musiccabinet.domain.model.music.Artist;
import com.github.hakko.musiccabinet.domain.model.music.Tag;
public class ArtistTopTagsHandler extends DefaultHandler {
private String artistName; // artist name this similarity is based on
private Artist sourceArtist; // artist based on artist name
private List<Tag> topTags = new ArrayList<>();
private Tag currentTag; // used internally while parsing
private State state; // stores state based on latest encountered start tag
private StringBuilder characterData; // used to assemble xml text passed by parser
private static final String TAG_TOP_TAGS = "toptags";
private static final String TAG_ARTIST = "artist";
private static final String TAG_NAME = "name";
private static final String TAG_COUNT = "count";
enum State {
NAME, COUNT;
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
if (TAG_TOP_TAGS.equals(qName)) {
artistName = attributes.getValue(TAG_ARTIST);
sourceArtist = new Artist(artistName);
} else if (TAG_NAME.equals(qName)) {
currentTag = new Tag();
state = NAME;
characterData = new StringBuilder();
} else if (TAG_COUNT.equals(qName)) {
state = COUNT;
characterData = new StringBuilder();
} else {
state = null;
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (state == NAME) {
String chars = characterData.toString();
currentTag.setName(chars);
} else if (state == COUNT) {
String chars = characterData.toString();
currentTag.setCount(toShort(chars));
topTags.add(currentTag);
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if (state != null) {
characterData.append(ch, start, length);
}
}
/* Variables to be exposured after parsing */
public Artist getArtist() {
return sourceArtist;
}
public List<Tag> getTopTags() {
return topTags;
}
}